What BMW models does the K&N 33-2344 fit?K&N 33-2344 drop-in air filters are engineered for a precise fit on 2004-2010 BMW 525i, 525xi, 528i, and five additional specific models.How does the K&N air filter improve engine performance?Designed to increase horsepower, this washable reusable air filter utilizes a state-of-the-art layered oiled cotton media for improved airflow.K&N Drop-in Air Filters deliver a significant boost in performance for 2004-2010 BMW 525i/525xi/528i models, achieving a top score of 9 for Engine Performance. Their state-of-the-art layered oiled cotton media is engineered to improve airflow and capture contaminants. Experience sustained power and responsiveness with this premium Air Filter – Drop In upgrade.Key Featureswashable reusable High-Flow Air Filtersstate-of-the-art design of layered oiled cotton mediaengineered to improve airflow and capture contaminantsdesigned to provide an increase in horsepowerreusable engineered to last for the entire lifespan of your vehiclebacked by K&N’s 10-Year/Million Mile Limited WarrantyWhy Choose the KN Drop in Air FiltersDelivers sustained power and responsiveness with every drive.Achieves superior engine protection by trapping more dirt.Provides a noticeable boost in horsepower for exhilarating acceleration.Transforms your driving experience with unrestricted engine breathing.Who Is This For?Street Performance 8/10Engineered to improve airflow and increase horsepower.Track / Autocross 8/10Designed to provide an increase in horsepower.Drag Racing 7/10Potential for increased horsepower can aid acceleration.Engine Performance 9/10Improves airflow and designed for horsepower increase.Easy DIY Install 10/10Drop-in install type, easy to replace existing filter.Racing Competition 7/10Designed to provide an increase in horsepower.Frequently Asked QuestionsWhat is a K&N drop-in air filter and how does it perform for a 2004-2010 BMW 5 Series?A K&N drop-in air filter is a washable, reusable High-Flow Air Filter engineered to improve engine airflow and capture contaminants. For your 2004-2010 BMW 525i/525xi/528i, it achieves a score of 8 for Street Performance due to its horsepower-increasing design. This upgrade ensures sustained power and responsiveness for your vehicle.How do I clean a K&N drop-in air filter?Cleaning a K&N drop-in air filter is a simple maintenance task using a K&N Recharger kit. Its reusable, engineered design means it can be cleaned and re-oiled, restoring its peak performance. This ensures your filter lasts for the entire lifespan of your vehicle.Is upgrading from a stock air filter to a K&N drop-in air filter beneficial for my BMW?Upgrading to a K&N drop-in air filter is worth it for enhanced engine performance and easy DIY installation. Its state-of-the-art layered oiled cotton media is designed to provide a noticeable boost in horsepower. This offers a clear performance advantage over standard paper filters.What kind of performance increase can I expect from a K&N drop-in air filter?A K&N drop-in air filter is designed to provide an increase in horsepower, contributing to exhilarating acceleration. Its Engine Performance usage score is 9, reflecting its capability to improve airflow and deliver sustained power. Experience a noticeable boost in horsepower with this upgrade.What vehicles are compatible with the K&N drop-in air filter?This K&N drop-in air filter is specifically designed to fit 2004-2010 BMW 525i, 525xi, and 528i models, along with five other compatible vehicles. Its drop-in install type ensures a direct replacement for your existing filter. You can be confident in its precise fitment for your BMW.Additional ResourcesOfficial K&N Engineering Product PageInstallation Guide (PDF)Important Notices Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.{“@graph”:[{“mpn”:”33-2292″,”sku”:”KNN33-2292″,”gtin”:”024844105813″,”name”:”KN Drop in Air Filters”,”@type”:”Product”,”brand”:{“url”:”https://www.knfilters.com”,”name”:”K&N Engineering”,”@type”:”Brand”,”sameAs”:”https://en.wikipedia.org/wiki/K&N_Engineering”},”image”:”https://d32vzsop7y1h3k.cloudfront.net/61f5f3434da80dd5483562275976940a.JPG”,”offers”:{“@type”:”Offer”,”price”:”68.99″,”seller”:{“url”:”https://www.motorsportmayhem.com”,”name”:”Motorsport Mayhem”,”@type”:”Organization”},”availability”:”https://schema.org/InStock”,”itemCondition”:”https://schema.org/NewCondition”,”priceCurrency”:”USD”,”priceValidUntil”:”2027-05-27″},”category”:”Air Filters – Drop In”,”description”:”Delivers sustained power and responsiveness with every drive. Achieves superior engine protection by trapping more dirt. Designed to provide an increase in horsepower”,”isRelatedTo”:{“name”:”Air Filters – Drop In”,”@type”:”Thing”},”alternateName”:”K&N Drop in Air Filter Horsepower Gain”,”add